Ports: Enable jpeg/png for libsixel

Ports/libsixel/package.sh

@@ -6,13 +6,15 @@ configopts=(
     "--cross-file=${SERENITY_BUILD_DIR}/meson-cross-file.txt"
     "--buildtype=release"
     "-Dgd=disabled"
-    "-Djpeg=disabled"
-    "-Dpng=disabled"
     "-Dlibcurl=disabled"
 )
 files=(
     "https://github.com/libsixel/libsixel/archive/refs/tags/v${version}.tar.gz#b6654928bd423f92e6da39eb1f40f10000ae2cc6247247fc1882dcff6acbdfc8"
 )
+depends=(
+    'libjpeg'
+    'libpng'
+)
 
 configure() {
     run meson setup build "${configopts[@]}"